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The spermatozoa were characterised by the presence of a short head, short midpiece and long principal piece. The head consisted of a reduced acrosome that contained moderately electron\u2010dense homogenous material. The implantation fossa was observed between the base of the nucleus and the proximal centriole. The midpiece contained electron\u2010dense material associated with the proximal centriole and nuclear membrane, and a long distal centriole surrounded throughout its length by 11\u201312 elliptical mitochondria. A dense annulus separating the midpiece from the principal piece was visible. Posterior to the annulus, the axoneme was formed surrounded by a dense fibrous sheath, representing the principal piece or flagellum, which was a long segment with a smooth surface and a smaller diameter than the midpiece. The spermatozoon of the domestic duck resembles that of other non\u2010passerine birds, corresponding to a basic type of spermatozoon similar to that of reptiles, called sauropsid type.<\/jats:p>","DOI":"10.1111\/j.1439-0264.2011.01124.x","type":"journal-article","created":{"date-parts":[[2012,1,3]],"date-time":"2012-01-03T05:45:48Z","timestamp":1325569548000},"page":"202-208","source":"Crossref","is-referenced-by-count":5,"title":["Ultrastructure of the Spermatozoa of the Domestic Duck (<i>Anas platyrhynchos<\/i> sp.)"],"prefix":"10.1111","volume":"41","author":[{"given":"K.","family":"Sim\u00f5es","sequence":"first","affiliation":[{"name":"Departamento de Morfologia Instituto de Ci\u00eancias Biol\u00f3gicas Universidade Federal de Goi\u00e1s, UFG Goi\u00e2nia, Goi\u00e1s CEP 74001\u2010970 Brasil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"A. 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